<html class="reftest-wait">
<head>
<script type='text/javascript'>
function changeAltText(img)
{
        img.alt = img.alt + ". I'M INVISIBLE!";
        document.documentElement.className = "";
}
</script>
</head>
<body onload="changeAltText(document.images[0])">
<img src='data:text/plain,' alt="initial">
</body>
</html>
